Comment on

• Effect of a copayment on use of the emergency department in a health maintenance organization.

  Selby JV, Fireman BH, Swain BE. Selby JV, et al. N Engl J Med. 1996 Mar 7;334(10):635-41. doi: 10.1056/NEJM199603073341006. N Engl J Med. 1996. PMID: 8592528
• The costs of visits to emergency departments.

  Williams RM. Williams RM. N Engl J Med. 1996 Mar 7;334(10):642-6. doi: 10.1056/NEJM199603073341007. N Engl J Med. 1996. PMID: 8592529